एपीए उद्धरण

Gupta,P.K, & Hira,D.S. (1991). Problems in Operations Research: Principles and solutions. S.Chand & company Ltd.

शिकागो स्टाइल उद्धरण

Gupta,P.K, और Hira,D.S. Problems in Operations Research: Principles and Solutions. New Delhi: S.Chand & company Ltd, 1991.

एमएलए उद्धरण

Gupta,P.K, और Hira,D.S. Problems in Operations Research: Principles and Solutions. S.Chand & company Ltd, 1991.